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Lessons learned from human HIV vaccine trials.

Justin Pollara1, David Easterhoff, Genevieve G Fouda

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Analyzing B-cell responses in HIV vaccine trials reveals how non-neutralizing antibodies contribute to protection. This research identifies early antibody lineages that could be guided towards developing broadly neutralizing antibodies for a global HIV vaccine.

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Area of Science:

  • Immunology
  • Vaccinology
  • Virology

Background:

  • Inducing broadly neutralizing antibody (bNAb) responses is critical for an effective HIV vaccine.
  • Current human vaccine trials have not yet achieved broad plasma neutralization of primary HIV isolates.

Purpose of the Study:

  • To analyze the vaccine-induced memory B-cell repertoire for insights into subdominant B-cell responses.
  • To identify the initiation of antibody lineages with potential for neutralization breadth.

Main Methods:

  • Characterization of monoclonal antibodies from an HIV-1 vaccine trial.
  • Analysis of B-cell repertoire shifts following vaccine boosts.

Main Results:

  • Monoclonal antibodies from the trial demonstrated mechanisms of protection by non-neutralizing antibodies.
  • Vaccine boosts altered the HIV-specific B-cell repertoire, expanding cells with features of bNAb lineages (long CDR-H3).

Conclusions:

  • Detailed memory B-cell repertoire analysis and monoclonal antibody functional evaluation offer valuable insights from human vaccine trials.
  • This knowledge can inform the rational design of strategies to mature disfavored bNAb lineages.